I am a bit late replying but you could try going to devices and printers and remove the Dlink USB adapter..
This is on win 7
I am on Vista and the Dlink DPH-50Udid not show up in Device Manage.
The problem was that I could not remove the Dlink Monitor software from Add/Remove Programs or anywhere else.
Here is my solution:
go to msconfig.exe
go to the Startup tab
find the Dlink Monitor software and de-select it.
that was the best that I could figure out. The software is still on my computer but at least it does not run as far as I know. Pain in the ____ to not be able to uninstall it though.